Hi,
Thanks for providing the links and the screenshots. I have been in mobile apps development in Sencha Touch, HTML5, Phonegap, CSS3 etc for last 3.5 years and in this period I have developed a number of apps for iOS, android, blackberry devices. Even for meeting some special/custom requirements I had to develop custom sencha touch HTML5 UI components like waterwheel, flipper, vertical slider etc. and successfully used those in more than one apps for devices.
From your description and link provided I understand that your app should be a twitter client i.e using twitter javascript API and also include Geolocation GPS functionality. I have experience in that area also as I have used ESRI maps, google maps , openstreetmaps etc in my previous mobile apps.
Please let me know if you are interested in working with me or if you have any question.
Thanks,
Ayan Dasgupta.